Sectional boom



J. T. HORTON.

SECTIUNAL BOOM.

APPLICATION FILED APR. 2s.- I920.

Patented Jan. 18, 1921.

. Inventor, JohnJTJfoftarz;

hisAztorn y.

UNITED STATES JOHN T. HORTON, BROOKLYN, NEW YORK.

SECTIONAL 1300M.

Specification of Letters Patent.

Patented Jan. 18, 1921.

Application filed April 2a, 1920. no. 3Th,%8.

To all whom it may concern Be it known that'I, Jonas '1. HORTON, a citizen of the United States, and a resident of New York, borough of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Sectional Booms, of which the following is a specification.

This invention relates to sectional booms and has for its object to provide a structure oi? the class specified oi simple and rigid construction, and which may be formed of relatively short members. lVith these objects in view and others which will appear later herein my improvements comprise features which are illustrated in their prei'erred embodiment in the drawings accompanying this specification, wherein Figure 1 is a front elevation of my improved sectional boom in its assembled condition. Fig. 2 is a similar view with portions near either end broken out. 3 is a front elevation of a portion of one end member separated from the remaining; por tions of the boom. Fig. 4 is a front elevation of a portion oi? one end member and the centralcore member assembled. 5 is an end elevation looking toward the right in Fig; l. Fig. 6 is an end elevation looking toward the left in Fig. 3. Fig. '7 is an end elevation of the central core member. Fig. 8 is an end elevation corresponding with Fig. 2. The scale of Figs. 2 to 8 in elusive is. the same and the scale of Fig. 1 is about one half that of the other figures.

When booms or other spars are formed of one piece of Wood, they are open to the 0bjection of unnecessary weight and undue cost. Also, if built up of two or more members running the full length of the boom, in many cases the length of: the boom is objectionable and cumbersome in shipping. Also,

the present cost of long timbers is excessive.

With my improvements, not only can a boom be constructed much lighter than as if made of one piece, but much more convenient, under many circumstances, than as if made of a plurality of pieces of substantially the full length of the boom.

My improved boom comprises a central core member 2 of cruciform cross-section having seats, as 3, in each ofits corners for the reception of the four timbers as 6, 7, S and 9, respectively, comprising each of the end members 4W5 of the boom. Said core member is of suflicient length to provide gether by bolts as 23, 524i.

adejuate seats for said corner timbers and adequate lengthwise spacing for the holding bolts as 10, 11. End member I} may be provided with a spacing member 16 of cruciiiorm shape forholdingr the inner ends, respectively, oi. timbers 6, 7, 8 and 9 in suitable relation to each other and to core rne1n her 2, with which said timbers engage when the boom assembed. Said member 16 may be secured to timbers (5, emu 9 by some convenient means not shown. The several niembei'soi' my improvedboom may be se eured' togetl'icr by suitable bolts, as said bolts 10, ill, and in some cases i'eii'rtorcino plates, as l'l', 18, may be employed for the bolt heads and nuts to pull against and to generally strensthen the joint portion oi? the structure, .rriurther important feature oi my improved boom is the hey pins, as 19, 20, which are efficient to prevent the corner timbers from moving; endwise relatively to core member 2 when the nblcd boom is subjected to bendinp These hey pins lie in opposite somi-cylindrical seats as 21 in tin 'ier t3 and 22 in the opposite arm portions or. core member 2, said seat being :ltully cylindrical) where passes through the central portion of said core member.

The timbers at the outer extremities of end members 4:, 5, respectively, of the boom are brought together to form a four-part scmare end. see Fig. 8, and are secured to- Said ends are also provided with key pins 25, 26 to prevent endwise movement oi timbers 6, 7, S and 9 relatively toeach other at those ends.

Also said key pins are arranged in pairs or sets having pins at right angles to each other, as pins 25, 26 of the pair at one end of the boom, and set 27, 28, 29 and 30 near the middle of the boom, wherein pins 27, 28 are at right angles to pins 29, 30. By this arrangement the several lengthwise timbers are prevented from relative lengthwise movement against bending stress from any opposite end members each comprisi screwed on, and the key pins as 19, 20 are driven into place thereby securing the opposite end members 4, 5 and the central core member 2 into one relatively light but rigid structure.

lVhile I have described my improved device as built of timbers, that is, wood, it will be understood that I do not limit my self to any particular material as said timbers may be formed from metal or other convenient material. Therefore the term timber as used herein will be understood to include members or the general character described irrespective of the material of which they are made.

It is realized that the broad proposition of a poster spar having four corner members spaced apart midway their lengths by a cruciform member and the corner members broughttogether at their ends, respectively, has long been known, and no claim is made to such known construction.

What I do claim is 1. A sectional boom comprising a pair of opposite end members, each of said end members comprising a plurality of length- Wise timbers, a central core member, and means for detachably securing the end members and the core together. 7

p 2." A sectional boom comprising a pair of four lengthwise timbers, a central cruciform core member having seats, and means for detachably securing the timbers of said end members in the core member seats, respectively.

3. A sectional boom comprising a pair of opposite end members, each of said end mcmbers comprising a plurality of lengthwise timbers, a central core member, means for detachably securing said end members and core together, and means in coengagement with an end member and with the core for preventing relative endwise movement of said end member and core member.

a. A sectional boom comprising a pair of opposite end members each comprising four lengthwise timbers, a central cruciform core member having seats, means for detachably securing the timbers oi said end members in the core member seats, respectively, and a set of key pins comprising two pairs of pins, the members 01'. each pair being disposed at right angles to the members of the other pair and each pin being in coengagement with two timbers and with the core member for preventing relative endwise movement oi said end members and core member.

5. In a sectional boom having an end member comprising four timbers brought together to form a four part square end, the combination of means for holding said our timl together at the end of said end member and a pair of key pins disposed at right angles to each other, each pin being seated for one half its circumference in one timber and for one half its circumference in an adjacent timber for preventing said timbers from moving endwise relatively to each other.

In witness whereof, I hereby afiix my signature this 22 day of April, 1920. i

JOHN T. HORTON. 

